However, the transportation aspect is different in China compared to other countries; the train is the most important transportation vehicle in China rather than the airplane as in western countries. A high-speed railway is becoming more and more popular throughout the country. Its maximum operation speed is already 350 km/h, and the experimental speed is 605 km/h, which implies that 500 km/h is very promising for 2020 when 5G will be deployed. Therefore, China regards transportation scenarios as important 5G use cases, and the mobility requirement is above 500 km/h. Considering China’s large population, ultra-high traffic volume density and ultra-high connection density are real challenges for 5G systems, which are interpreted as absolute KPIs given in Table 1. In addition, spectrum efficiency and cost efficiency are envisioned to be enhanced by a factor of 100 compared to today’s network.